Accession Number : AD0650687

Title :   COSMIC RAY.

Descriptive Note : Final rept., 23 Jan 66-23 Jan 67,

Corporate Author : BENDIX CORP ANN ARBOR MICH AEROSPACE SYSTEMS DIV

Personal Author(s) : Wainio,Kendle M. ; Colvin,Theodore H. ; Moore,Keith A. ; Tiffany,Otho L.

Report Date : 23 FEB 1967

Pagination or Media Count : 64

Abstract : Results of calculations to determine specific yield functions for IGY neutron monitors are reported for vertically incident cosmic ray protons in the range of 1 < Pc < 6 Gv. The Monte Carlo method is used to calculate secondary nucleon flux intensities at atmospheric depths of 312, 680, and 1000 g/sq cm. Experimental data on neutron monitor response are employed to relate the calculated flux data on count rates, and hence to specific yields, at the corresponding depths. Comparison with empirical data for the specific yield function at sea level shows fair agreement for rigidities less than 3 Gv, but calculated yields are considerably smaller than the empirical data at higher rigidities. Various possible explanations for the discrepancy are discussed. At this time, the most probable cause appears to be the assumption that vertically incident cosmic rays produce most of the counts registered by neutron monitors. (Author)

Descriptors :   (*COSMIC RAYS, *RADIATION MEASURING INSTRUMENTS), NEUTRON COUNTERS, NEUTRON FLUX, COUNT RATE METERS, ENERGY, MONTE CARLO METHOD, PROBABILITY

Subject Categories : Nuclear Instrumentation

Distribution Statement : APPROVED FOR PUBLIC RELEASE